New dynamical measurements of the velocity of shear waves and of the rigidity at high pressures are presented for a few igneous rocks, and for a group of sedimentary and metamorphic rocks from the Boston area. The results include the changes of velocity on heating to 150° C, at 4,000 kg/cm² and at 9,000 kg/cm² for the igneous rocks, at 4,000 kg/cm² for the other rocks. The dependence of velocity upon composition is briefly discussed.
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Birch et al. (1940) studied this question.
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